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Heating degree days and cooling degree days for thousands of locations worldwide. Download free data in a simple spreadsheet format.
Heating degree day (HDD) is a measurement designed to quantify the demand for energy needed to heat a building. HDD is derived from measurements of outside air temperature. The heating requirements for a given building at a specific location are considered to be directly proportional to the number of HDD at that location. Related measurements ...
A heating degree day (HDD) is the degrees that a day's average temperature is below 65 Fahrenheit (18 Celsius), used to quantify the demand for energy.
Degree days are based on the assumption that when the outside temperature is 65°F, we don't need heating or cooling to be comfortable. Degree days are the difference between the daily temperature mean, (high temperature plus low temperature divided by two) and 65°F.
Cooling degree days (CDDs) are a measure of how hot the temperature was on a given day or during a period of days. A day with a mean temperature of 80°F has 15 CDDs. If the next day has a mean temperature of 83°F, it has 18 CDDs. The total CDDs for the two days is 33 CDDs.
This online calculator pulls weather station data--including heating and cooling degree days (HDD and CDD)--from more than 900 weather stations around the United States and Canada. Use the weather normalization data here to adjust your building's or industrial plant's energy usage data for changes in weather.
A "degree day" is a unit of measure for recording how hot or how cold it has been over a 24-hour period. The number of degree days applied to any particular day of the week is determined by calculating the mean temperature for the day and then comparing the mean temperature to a base value of 65 degrees F .
Figure 1 shows each year’s average heating and cooling degree days across the contiguous 48 states. Figures 2 and 3 show how heating and cooling degree days have changed by state, based on a comparison of the first 65 years of available data (1895–1959) with the most recent 64 years (1960–2023).
A tool to calculate heating and cooling degree days in the United States and Canada based on specific zip codes and dates.
The degree day calculator is a useful tool for measuring heating and cooling needs, helping homeowners and businesses manage energy consumption. Degree days are a metric used in various industries, especially agriculture and energy, to estimate the demand for heating and cooling based on temperature variations.